“Oh what a blow” (edited from what I obviously wasn’t allowed to say by autocensor...)It seems to dynamically alter formatting well when you shrink the width of the page too. But there is a LOT of wasted space when you go full screen - more than there is with the existing forum's 'FIXED' themes.
To be fair, I know the existing forum is pretty dire on a mobile, so it’s great that there will be better functionality for mobile users. It would be even better if there is also a suitable desktop mode that doesn’t waste loads of space and end up looking like a Janet and John Ladybird book. I find those minimalist e x p a n s i v e type of sites very difficult to read and concentrate on, paradoxically.